diff options
| author | Moritz Fischer <mdf@kernel.org> | 2018-05-04 10:18:33 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2018-05-07 23:30:03 -0400 |
| commit | abcd3d6fc640aff48b17900734eff134f27fdf2a (patch) | |
| tree | b6d7bb613de4014751562c425a72ef1542a009a0 /drivers/net/ethernet | |
| parent | 1751eb42ddb56b1e0a28ade5c5f19b7961a6f0c2 (diff) | |
| download | linux-abcd3d6fc640aff48b17900734eff134f27fdf2a.tar.bz2 | |
net: nixge: Fix error path for obtaining mac address
Fix issue where nixge_get_nvmem_address() returns a non-NULL
return value on a failed nvmem_cell_get() that causes an invalid
access when error value encoded in pointer is dereferenced.
Furthermore ensure that buffer allocated by nvmem_cell_read()
actually gets kfreed() if the function succeeds.
Fixes commit 492caffa8a1a ("net: ethernet: nixge: Add support for
National Instruments XGE netdev")
Reported-by: Alex Williams <alex.williams@ni.com>
Signed-off-by: Moritz Fischer <mdf@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/ethernet')
| -rw-r--r-- | drivers/net/ethernet/ni/nixge.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/drivers/net/ethernet/ni/nixge.c b/drivers/net/ethernet/ni/nixge.c index 27364b7572fc..c41fea9253e3 100644 --- a/drivers/net/ethernet/ni/nixge.c +++ b/drivers/net/ethernet/ni/nixge.c @@ -1170,7 +1170,7 @@ static void *nixge_get_nvmem_address(struct device *dev) cell = nvmem_cell_get(dev, "address"); if (IS_ERR(cell)) - return cell; + return NULL; mac = nvmem_cell_read(cell, &cell_size); nvmem_cell_put(cell); @@ -1202,10 +1202,12 @@ static int nixge_probe(struct platform_device *pdev) ndev->max_mtu = NIXGE_JUMBO_MTU; mac_addr = nixge_get_nvmem_address(&pdev->dev); - if (mac_addr && is_valid_ether_addr(mac_addr)) + if (mac_addr && is_valid_ether_addr(mac_addr)) { ether_addr_copy(ndev->dev_addr, mac_addr); - else + kfree(mac_addr); + } else { eth_hw_addr_random(ndev); + } priv = netdev_priv(ndev); priv->ndev = ndev; |